Final answer:
The sign of work on a volume/pressure graph is determined by the direction of the arrows. Arrows pointing from left to right indicate work being done by the system (positive work), while arrows pointing from right to left indicate work being done on the system (negative work).
Step-by-step explanation:
On a volume/pressure graph, the sign of work can be determined based on the direction of the arrows. If the arrows are pointing from left to right, it indicates that work is being done by the system. In this case, the work is positive. If the arrows are pointing from right to left, it indicates that work is being done on the system. In this case, the work is negative.
For example, if you have a graph where the arrows start from a lower pressure and move towards a higher pressure, it means the system is doing work and the work is positive. Conversely, if the arrows start from a higher pressure and move towards a lower pressure, it means work is being done on the system and the work is negative.